Will Splinterlands automaticaly change our card rents to one dec or will we have to change them manually?
All cards not rented at the time of the change have been updated to the new price, in fact in the rental market the search by lowest price displays only cards from 1 DEC
Are we allowed to continue existing rental contracts which are less then one dec?
Yes rental cards before the change keep the old price and old contract until expiration.
In fact I went to see your renta-history is you have an active rental at 0.100 DEC